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pixeldelegate.cpp Example File
itemviews/pixelator/pixeldelegate.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2004-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** Licensees holding a valid Qt License Agreement may use this file in
 ** accordance with the rights, responsibilities and obligations
 ** contained therein.  Please consult your licensing agreement or
 ** contact [email protected] if any conditions of this licensing
 ** agreement are not clear to you.
 **
 ** Further information about Qt licensing is available at:
 ** http://trolltech.com/products/appdev/licensing.
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 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 ****************************************************************************/

 #include <QtGui>

 #include "pixeldelegate.h"

 PixelDelegate::PixelDelegate(QObject *parent)
     : QAbstractItemDelegate(parent)
 {
     pixelSize = 12;
 }

 void PixelDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const
 {
     if (option.state & QStyle::State_Selected)
         painter->fillRect(option.rect, option.palette.highlight());

     int size = qMin(option.rect.width(), option.rect.height());
     int brightness = index.model()->data(index, Qt::DisplayRole).toInt();
     double radius = (size/2.0) - (brightness/255.0 * size/2.0);
     if (radius == 0.0)
         return;

     painter->save();
     painter->setRenderHint(QPainter::Antialiasing, true);
     painter->setPen(Qt::NoPen);
     if (option.state & QStyle::State_Selected)
         painter->setBrush(option.palette.highlightedText());
     else
         painter->setBrush(QBrush(Qt::black));

     painter->drawEllipse(QRectF(option.rect.x() + option.rect.width()/2 - radius,
                                 option.rect.y() + option.rect.height()/2 - radius,
                                 2*radius, 2*radius));
     painter->restore();
 }

 QSize PixelDelegate::sizeHint(const QStyleOptionViewItem & /* option */,
                               const QModelIndex & /* index */) const
 {
     return QSize(pixelSize, pixelSize);
 }

 void PixelDelegate::setPixelSize(int size)
 {
     pixelSize = size;
 }


Copyright © 2008 Nokia Corporation and/or its subsidiary(-ies) Trademarks
Qt 4.4.3